<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
            outline: 0;
        }
        .body{
            height: 200px;
        }
        .wings .green{
            background-color: green;
        }
        .wings .w150{
            background-color: orange;
            height: 100px;
            width: 150px;

        }
        .wings main{
            float: left;
            
            width: 100%;
        }
        .wings .inner{
            height: 100px;
            margin: 0 150px;
        }
        .wings .left{
            float: left;
            margin-left: -100%;
        }
        .wings .right{
            float: left;
            margin-left: -150px;
        }

    </style>
</head>
<body>
    <div class="layout">
        <h4>方法二：双飞翼布局</h4>
        <section class="wings clearfix">
            <main>
                <div class="green inner">inner</div>
            </main>
            <aside>
                <div class="w150 left">left</div>
            </aside>
            <aside>
                <div class="w150 right">right</div>
            </aside>
        </section>
    </div>
</body>
</html>